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DESCRIPTION JP2004146985

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DESCRIPTION JP2004146985
[Problem] To provide a speaker system with built-in amplifier which can lower the inside
temperature of an enclosure without raising noise and impairing sound quality. A speaker system
with built-in amplifier of the present invention outputs a predetermined low frequency signal S to
a speaker unit 3 via a speaker unit 3 provided in an enclosure 2 and a built-in amplifier 4 built in
an enclosure 2 A signal output unit 5 is provided, and the speaker unit 3 is operated by a
predetermined low frequency signal S to circulate the inside air of the enclosure 2. [Selected
figure] Figure 1
Amplifier built-in speaker system
[0001] The present invention relates to an amplifier built-in speaker system which incorporates
an amplifier inside the enclosure, and in particular, it is possible to lower the inside temperature
of the enclosure without increasing the noise and the sound quality. It relates to an amplifier
built-in speaker system. 2. Description of the Related Art A conventional speaker system with
built-in amplifier incorporates an amplifier in an enclosure, and the output capacity can not be
increased due to the heat generation problem of the built-in amplifier, and a desired output can
be obtained. There is a case where there is not (see, for example, Patent Document 1). For this
reason, some conventional speaker systems with built-in amplifiers have a forced cooling
mechanism such as a fan provided inside the enclosure to lower the inside air temperature.
However, when a forced cooling mechanism is provided, the enclosure is used. The forced
cooling mechanism may be damaged from the back pressure of the sound and vibration by the
speaker unit inside, and the noise may be increased by the forced cooling mechanism and the
sound quality of the speaker may be impaired. Patent Document 1: Japanese Patent Application
Laid-Open No. 2001-28797 SUMMARY OF THE INVENTION The present invention has been
made to solve such conventional problems, and noise is increased. It is an object of the present
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invention to provide a speaker system with built-in amplifier which can lower the inside
temperature of the enclosure without affecting the sound quality or the sound quality. A speaker
system with built-in amplifier according to the present invention comprises a speaker unit
provided in an enclosure, and a low frequency signal defined in advance through the built-in
amplifier built into the enclosure. And a signal output unit for outputting to the unit. According to
this configuration, it is possible to operate the speaker unit by a predetermined low frequency
signal to circulate the inside air of the enclosure, and to lower the inside air temperature of the
enclosure without increasing the noise and the sound quality. The speaker system with built-in
amplifier according to the present invention further comprises an inside air temperature
detection means for detecting the inside air temperature of the enclosure, and when the inside
air temperature detected by the inside air temperature detection means exceeds a predetermined
temperature value, The signal output means is configured to output the low frequency signal to
the built-in amplifier. According to this configuration, the inside temperature of the enclosure can
be reduced efficiently with less power.
In the amplifier built-in speaker system of the present invention, the enclosure has a bass reflex
port. According to this configuration, the inside air and the outside air of the enclosure can also
be circulated, and the inside air temperature of the enclosure can be lowered more efficiently. In
the amplifier built-in speaker system according to the present invention, the low frequency signal
is a signal having a frequency lower than a resonance frequency of the bass reflex port.
According to this configuration, it is possible to make it difficult to hear the signal sound of a
predetermined low frequency signal. In the amplifier built-in speaker system according to the
present invention, a resonance frequency of the speaker unit is lower than a resonance frequency
of the bass reflex port, and the low frequency signal is a sine wave. According to this
configuration, it is possible to surely make the signal sound of the predetermined low frequency
signal inaudible, and to lower the inside air temperature of the enclosure more effectively.
Furthermore, in the amplifier built-in speaker system of the present invention, the low frequency
signal has a frequency outside the human audio frequency band. According to this configuration,
it is possible to make it difficult to hear the signal sound of the predetermined low frequency
signal with certainty. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter,
embodiments of the present invention will be described with reference to the drawings. FIG. 1
shows a configuration diagram of a speaker system with a built-in amplifier according to a first
embodiment of this invention. As shown in FIG. 1, the speaker system 1 with built-in amplifier
according to the first embodiment of the present invention includes a speaker unit 3 provided in
the enclosure 2, a built-in amplifier 4 built in the enclosure 2, and an enclosure And a signal
output means 5 for outputting a low frequency signal S for lowering the inside air temperature to
the speaker unit 3 via the built-in amplifier 4. Next, the operation of the amplifier built-in speaker
system 1 according to the first embodiment of this invention will be described. When the speaker
unit 3 is operated by the audio signal output from the built-in amplifier 4, the signal output
means 5 always outputs a low frequency signal S lower than the resonance frequency of the bass
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reflex port 8 to the built-in amplifier 4 Do. The built-in amplifier 4 amplifies the input low
frequency signal S and outputs it to the speaker unit 3. The speaker unit 3 operates in a vibrating
state by the low frequency signal S, and circulates the inside air and the outside air of the
enclosure 2 through the bass reflex port 8 of the enclosure 2 to lower the inside air temperature
of the enclosure 8.
In addition, the low frequency signal S operates the speaker unit 3 in a vibrating state as a sine
wave, and the inside air and the outside air of the enclosure 2 can be effectively circulated. FIG. 2
shows an impedance characteristic diagram of the enclosure 2 in the amplifier built-in speaker
system according to the first embodiment of this invention. As shown in FIG. 2, in the amplifier
built-in speaker system of the first embodiment of the present invention, the resonance
frequency 18 of the speaker unit 3 is set lower than the resonance frequency 19 of the bass
reflex port 8 and low frequency The frequency of the signal S is set lower than the resonance
frequency 19 of the bass reflex port. Therefore, when the speaker unit 3 is operated by the low
frequency signal S, particularly when the frequency near the resonance frequency 18 of the
speaker unit 3 is used, the inside temperature of the enclosure 2 can be effectively lowered. it
can. Further, since the low frequency signal S is set lower than the resonance frequency 19 of the
bass reflex port 8, it is difficult to reproduce as sound, and it is possible to surely prevent the
noise from rising and the sound quality from being impaired. As described above, in the amplifier
built-in speaker system 1 according to the first embodiment of the present invention, the speaker
unit 3 is operated by the low frequency signal S to circulate the inside air and the outside air of
the enclosure 2. , The inside temperature of the enclosure 8 can be lowered. In addition, the low
frequency signal S is difficult to reproduce as voice, and it is possible to make noise rise and to
make it difficult to deteriorate the sound quality. FIG. 3 shows a configuration diagram of a
speaker system with a built-in amplifier according to a second embodiment of this invention. As
shown in FIG. 3, in the amplifier built-in speaker system 21 according to the second embodiment
of the present invention, a speaker unit 23 provided in the enclosure 22, a built-in amplifier 24
built in the enclosure 22, and an enclosure A signal output means 25 for outputting a low
frequency signal S for lowering the inside air temperature 22 to the speaker unit 23 through the
built-in amplifier 4 and an inside air temperature detection means 27 for detecting the inside air
temperature. Next, the operation of the amplifier built-in speaker system 21 according to the
second embodiment of this invention will be described. When the speaker unit 23 is operated by
the audio signal from the built-in amplifier 24, the inside air temperature detection means 27
detects the inside air temperature T of the enclosure 22 and outputs it to the signal output
means 25.
The signal output means 25 outputs a low frequency signal S lower than the resonance
frequency of the bass reflex port 28 to the built-in amplifier 24 when the inside air temperature
T becomes higher than a preset setting value of the inside air temperature. The built-in amplifier
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24 amplifies the input low frequency signal S and outputs it to the speaker unit 3. The speaker
unit 23 operates in a vibrating state by the low frequency signal S, and circulates the inside air
and the outside air of the enclosure 22 through the bass reflex port 28 of the enclosure 22 to
lower the inside air temperature of the enclosure 28. In addition, the low frequency signal S
operates the speaker unit 23 in a vibrating state as a sine wave, and the inside air and the outside
air of the enclosure 22 can be effectively circulated. In the amplifier built-in speaker system of
the second embodiment of the present invention, as in the amplifier built-in speaker system of
the first embodiment of the present invention, the resonance frequency of the speaker unit 23 is
the resonance frequency of the bass reflex port 28. The frequency of the low frequency signal S
which is set lower than that of the bass reflex port 28 is set lower than the resonance frequency
of the bass reflex port 28. Therefore, when the inside air temperature T of the enclosure 22
becomes higher than the preset setting value and the speaker unit 23 is operated by the low
frequency signal S, in particular, the frequency near the resonance frequency of the speaker unit
23 is used When it is done, the inside air temperature of the enclosure 22 can be effectively
lowered. Further, since the low frequency signal S is set lower than the resonance frequency of
the bass reflex port 28, it is difficult to reproduce as sound, and it is possible to surely prevent
the noise from rising and the sound quality from being impaired. As described above, in the
amplifier built-in speaker system 21 according to the first embodiment of this invention, when
the inside air temperature T of the enclosure 22 becomes high, the speaker unit 23 is operated
by the low frequency signal S and the enclosure is The circulation between the inside air and the
outside air is performed efficiently, and the inside air temperature of the enclosure 22 can be
lowered. In addition, the low frequency signal S is difficult to reproduce as voice, and it is
possible to make noise rise and to make it difficult to deteriorate the sound quality. In the
amplifier built-in speaker system according to the first and second embodiments of the present
invention, although the open type in which the bass reflex port is provided in the enclosure has
been described, the present invention is not limited to this. Also in the closed type in which the
port is not provided, the inside air can be circulated in the same manner, and the inside air
temperature of the enclosure can be lowered without increasing the noise and the sound quality.
As described above, according to the present invention, the speaker unit is operated by the low
frequency signal to circulate the inside air of the enclosure, so that the inside air of the enclosure
is not deteriorated and the sound quality is not deteriorated. The temperature can be lowered.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a speaker system with an
amplifier according to a first embodiment of the present invention. FIG. 2 is an impedance of an
enclosure in the speaker system with an amplifier according to the first embodiment of the
present invention. Characteristic diagram [Fig. 3] Diagram of speaker system with built-in
amplifier according to the second embodiment of the present invention [Description of symbols]
1, 21 Speaker system with built-in amplifier 2, 22 Enclosure 3, 23 Speaker unit 4, 24 Built-in
amplifier 5 , 25 signal output means 7 room air temperature detection means 18 resonance
frequency of the speaker unit 19 resonance frequency of the bass reflex port
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